Engine valve mechanism



P.'LASSEN; EN 'GI NE VALVE MECHANISM. APPLICATEON FILED JAN. 14'. 1919.

Patented Aug. 22, I922 2 SHEETS-SHEET 1.

P. LASSEN,

EN'GI'NE VALVE MECHANISM. APPLICATION FILEDJAN-14. 1919- 1,42 6,4s6 Patented'Aug. 22, 1922.

2 sun's-sum 2.

PETER Lassen, or ocean FALLS, eairlsri COLUMBYIA, CANADA. 1'

.nnelnn .VALVE MECHANISM; I

This invention, relates to engine valve mechanism, the object in view being to pro vlde valvemechamsm especially adapted for use in conjunction with a reciprocatory steam engine, the valve mechanism embed ing cylindrical valve chambers and oscillatory valvesworking in said chambers and arranged at opposite ends or heads of the main cylinder of "the engine, combined with means controlled from and actuated'bythe engine shaft forimparting the necessary movements to and properly timing said Valves. V

With the above and other objects in view, the invention consists in the construction,

' combination and arrangementof .part's,.as

herein described, illustrated and claimed. I In the accompanying drawings Figure 1 is' a plan view partly in section V of a steam engine, illustrating the improved valve mechanism. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical longitudinal section through the main cylinder of the engine ex-i tending transversely through the cylindrical valve chambers.

Fig. 4 is a transverse section taken on the line 4-4: of Fig. 1.

In the embodiment illustrated, 1 desig nates the main cylinder of a steam engine,

2 the main piston mounted for reciproca tory movement in said cylinder, and 3 the piston rod, all of which are of usual construction. The invention comprises two cylindrical valve chambers 4 arranged at opposite ends of cylinder 1 perpendicular of the axis of said cylinder. The valve chambers 4: each communicate with one end of the cylinder 1 by means of a slot-like obliquely disposed port 5 which acts both as an inlet and exhaust port. Steam is led to and from the valve casings 4 by means of inlet and outlet pipes or conduits 6 and 7 respectively. The pipe 6 communicates with a steam supply plpe 8, and 9 represents an exhaust pipe which communicates with the ou let pipe or n u t 7 T pipes 6 nd 7 s ecification of Letters 1 am.

. Patented Application filed January 14, 1919. Seii fl No. 271, 93 v I v connnunicate at. their opp1osite" extremities w th the valve casingst, as shown Mounted for oscillatorymovement in each of the valve casings 4 is a hollow cylindrical valve 10 divided by a longitudinal partition chamber 13. This valve has I ope'ni.ng's 1 1 and 15 at its ends adapted to communicate with the pipes 6 and 7. This valve is pro?- vided also' with i a slot like inlet port, 16 and a s'imilarlyshaped exhaust port17 which are arrang'edlin opposite sides ofthe valve and are adapted to alternately; register with. the cyllnder'l. Each of thevalves lO'lias a stem or shaft 18 which extends through one end of its casing and fast on such projecting end 1s'.a crossbar 19 havinga substantially straight arm 20 and anotherarm-21 having an offset 22 between 'the ends thereoffas shown in Figure 2L Working conjunction wlthand 1n co-operativejrelation to the 11. into an in-let chamber l2i an'd aneXhaust bars 19 is a reciproc'atory valve operating 1 1 rod 23 which isarran'ged in spaced relation tQHfSlldB 24 to 'whichrit is fixedly was cted .by interposed sp acing members or st'rutsi25,

the slide 24- being co'nne'cted by 1 a pivot 26 to what is usually knownfas the eccentric ro d 27 of the engine, whereby recip rocat'ory mot on fis imparted to theslide'24 and th f01e to the'vali eactuating rod 23; [Theme 23 has laterally projecting-tripfingers which, in moving in one direction, act against the offset portions 22 of the cross arms 21 to turn the valve shafts 18 in one direction, said valve shafts being turned in the opposite direction by means of coil springs 29 which encircle said valve stems or shafts as shown in Figure 1. In conjunction with each of the cross bars 19, is employed a swinging trigger or stop 30 pivotally mounted at 31 on the engine frame. Eachtrigger has a shoulder 32 upon which one end of the adjacent cross bar 19 is adapted to rest when the operating arm23 is From the foregoing description, taken in ings, it Will be seen that the valve operating rod 23 is reciprocated by its connection with the crank shaft of the engine through rod 27. As the piston 2 moves toward one head of the cylinder 1, the dead steam in front of said piston is exhausted through the adjacent valve 4 and just before the stroke of the piston is completed, the rod 23 trips the bar 19 of the valve and the valve is quickly turned by means of its spring 29 to the inlet position. Live steam is then admitted to this end of the cylinder from which the dead steam has been exhausted and acts to drive the piston in the reverse direction, exhaust taking place through thevalveat the opposite end of the cylinder, until the piston nearly reaches the end of that stroke when the valve at that end of the cylinder is quickly reversed by the action of its spring which is brought into operation by tripping of bar 19 by rod 23, and thereupon performs the function of a steam inlet valve. The valve operating rod 23 thus acts to set the valves in exhausting position and to trip the bars 19, so that the springs 29 may turn the valves to a steam admitting position.

From the foregoing description, taken in connection with the accompanying dra\v ings, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the inventon appertains and while. I have described the principle of operation of. the invention together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes may be made as are within the scope of the claimed invention.

Having thus fully described my invention, What I claim as new and desire to secure by Letters Patent, is

1. In a reciprocatory engine, the combination with an engine cylinder and crank shaft, of valve cylinders, hollow cylindrical valves mounted for oscillatory movement in said valve cylinders, cross arms fast on the stems of said valves, a reciprocatory valve operating rod driven by the engine shaft, springs for turning said valves in one direction, and triggers co-operating with said cross arms to hold the respective valves in one position, said triggers being adapted. to be shifted by said operating rod to release said cross arms.

2. In a reciprocatory engine, the combination with an engine cylinder and crank shaft, of Valve cylinders perpendicular to the axis of said cylinder, hollow cylindrical valves mounted for oscillatory movement i in said Valve cylinders, cross arms fast on the stems of said valves,a reciprocatory valve operating rod movable in a plane parallel to the piston movement and driven by the engine shaft, springs for turning said valves in one direction, triggers co-operating with said cross arms to hold the respective valves in a predetermined position, and fingers on said operating rod adapted to engage said cross arms to turn the valves in one direction and also adapted to trip said trigger to release the cross arms and permit the springs to turn the valves in ,the ,opposite direction. V In testimony whereof I afiix my signature in presence of two Witnesses.

PETER LASSEN.

Witnesses:

K. M. GILLsoN, M. C. QUIGLEY. 

